This had a fair amount of science, and having an invasive plant based dystopia was rather inspired. The characters are all well developed, and readers will find the allergies and other conditions interesting, especially since they have a creepy tie in to the plant invasion!
I loved the science, the evil plants, and the nonstop action! This reminded me a tiny bit of both Patterson's Maximum Ride and Faulkner's The Assault. Bloom is sure to be a hit, and the sequels will be worth the wait!